/*
 * Copyright 2022 The Open Islands Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.openislands.oi.rpc;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/***
 * RPC abstract callback
 * @param <Params>   invoke params
 * @param <Result>   return result
 */
@SuppressWarnings("unchecked")
public abstract class Generic<Params, Result> {
    public final Invoke<Params, Result> _invoke;

    public Generic(Invoke<Params, Result> invoke) {
        this._invoke = invoke;
    }

    public Class<Params> getParamsClass() {
        final Type genericSuperclass = this.getClass().getGenericSuperclass();
        final Type[] actualTypeArguments = ((ParameterizedType) genericSuperclass).getActualTypeArguments();
        return ((Class<Params>) actualTypeArguments[0]);
    }

    public Type getResultType() {
        final Type genericSuperclass = this.getClass().getGenericSuperclass();
        final Type[] actualTypeArguments = ((ParameterizedType) genericSuperclass).getActualTypeArguments();
        return actualTypeArguments[1];
    }

    public Result invoke(Params params) throws Exception {
        return this._invoke.invoke(params);
    }
}